Traffic engineering Q The data from moving observer methods as shown in the table. Column 1 gives the sample number, column 2 gives the number of vehicles moving against the stream, column 3 gives the number of vehicles that had overtaken the test vehicle, and last column gives the number of vehicles overtaken by the test vehicle. Find the flowrate, density and mean speed. Also, plot the fundamental diagrams of traffic flow. 2 3 4 No. Sample 1 107 10 74 2 113 25 41 3 30 15 5 4 79 18 9

Traffic engineering Q The data from moving observer methods as shown in the table. Column 1 gives the sample number, column 2 gives the number of vehicles moving against the stream, column 3 gives the number of vehicles that had overtaken the test vehicle, and last column gives the number of vehicles overtaken by the test vehicle. Find the flowrate, density and mean speed. Also, plot the fundamental diagrams of traffic flow. 2 3 4 No. Sample 1 107 10 74 2 113 25 41 3 30 15 5 4 79 18 9

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q3. The below Table shows the time and distance for 10 vehicles recorded during a traffic survey. Choose the correct answer of the following (Four only): 1. The Average Spot Speed of the sample in the Table equals: a. (68.5) Km/hr c. (19.21) Km/hr e. (18.9) Km/hr (20 Marks Time (sec) 5.0 Distance (m) b. (190.21) Km/hr d. (67.9) Km/hr f. None of them Distance/time (m/sec) 20.00 100 5.6 100 17.86 5.6 100 17.86 4.8 100 20.83 2. The Time Mean Speed (TMS) of the sample in the Table equals: a. 68.5 (Km/hr) c. 19.21 (Km/hr) e. 18.9 (Km/hr) 6.1 100 16.39 5.3 100 18.87 b. 190.21 (Km/hr) d. 67.9 (Km/hr)- f. None of them 5.9 100 16.95 5.2 100 19.23 4.5 100 22.22 5.0 100 20.00 3. The Space Mean Speed (SMS) of the sample in the Table equals: a. 68.5 (Km/hr) d. 67.9 (Km/hr) Total 53 1000 190.21 b. 190.21 (Km/hr) e. 18.9 (Km/hr) c. 19.21 (Km/hr) f. None of them 4. The Average travel Speed of the sample in the Table equals: a. 68.5 (Km/hr) d. 67.9 (Km/hr) b. 190.21 (Km/hr) e. 18.9 (Km/hr) c. 19.21…
A highway has directional arrival rate of 30 [veh/min] and capacity of 40 [veh/min]. At time t = 0 [min], an accident occurs and stops all traffic. At t = 20 [min], the accident is cleared, and the highway returns to its original capacity. What are the values of lambda (1) and mu (µ) at t= 30? a b At what time does the queue clear? Present your answer to the nearest minute.
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(c) Consider a section of a four-lane freeway (two lanes in each direction) as shown below. The freeway typically carries 2571 veh/hr during the morning peak period. An accident occurs at 8:00 AM at Point A, blocking the entire freeway in that direction. Fifteen minutes after the accident, one lane is cleared and traffic begins to flow again past point A. Assuming a triangular fundamental diagram as shown below, use shock wave analysis to answer the following questions: (1) Where is the end of the queue at 8:15 AM? (2) When (at what time) are the vehicles on the freeway last forced to stop by the queue? (3) What is the maximum size of the queue? (4) What is the maximum distance of the end of the queue from the accident site? At Time t = 8:00 AM *(k,) B A 15 miles At Time t = 8:15 AM i, (k,) *, (k,) *,(k,) *, (k,) , (k,) A miles Flow-density relationship (one lane) Flow-density relationship (two lanes) 4000 4000 when k
This is a three-part problem. Two sets of students are collecting traffic data at two roadway stations, station 130 + 00 and station 145 +00. Observations at station 130 + 00 show that five vehicles passed that section at intervals of 0, 3, 4, 3, and 5 sec, respectively. If the speeds of the vehicles were 50, 45, 40, 45, and 50 mph respectively. Note: Stationing is fundamental to highway plans. A station is the horizontal measurement along the Construction Survey Line of a project. Distances are measured and points are identified on plans with reference to station numbers. One hundred feet is equivalent to one station. Highway stationing might be compared with a rope having knots at 100-foot intervals. The beginning end of the rope would be 0, the first knot at 100 feet would be Station Number 1 and would be written as 1+00. The second station number would be 2 (which is 200 feet from the beginning) and would be written as 2+00, and so on. Part A. Determine the time mean speed, in mph.…
From the following data of a freeway surveillance, there are 4 vehicles counted for a length of 200 m and the following distances each had travelled when observed on the photographs taken every 3 seconds apart. Compute the following:i. Density of flow in vehicles per km (vpk). ii. Space mean speed in kph. iii. Flow rate, in vehicles per hour. SHOW COMPLETE SOLUTION. NEED ASAP. THNAK YOU
The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine The mean free speed The jam density The capacity The speed at maximum flow Speed(mi/h) Density (veh/mi) 14.2 85 24.1 70 30.3 55 40.1 41 50.6 20 55 15
5. An engineering student is driving on a roadway with a -1% grade and sees a traffic barricade 600 ft ahead in the middle of the roadway. Despite his best effort to stop in time, the student strikes the sign at a speed of 40 mi/hr. If the student was traveling at 70 mi/hr when the sign was first spotted, what was the student's associated perception-reaction time (use practical stopping distance). 6. A driver is traveling at 62 mi/hr on a wet road. An object is spotted on the road 600 ft ahead and the driver is able to come to a complete stop just before hitting the object. Assuming perception-reaction time of 2.5 seconds and practical stopping distance, determine the grade of the road.
6-9 Assuming that the expression: - k/k, us = Ufe can be used to describe the speed-density relationship of a highway, determine the capacity of the highway from the data below using regression analysis. k (veh/mi) u, (mi/h) 43 38.4 50 33.8 8. 53.2 31 42.3
Traffic engineering
Results of traffic flow studies on a highway indicate that the flow-density relationship can be described by the expression. Us q=uck - If speed and density observations give the data shown below, develop an appropriate expression for speed versus density for this highway. (Use the following as necessary: k. Assume u is in mi/h and k is in veh/mi. Do not include units in your answer.) Speed (mi/h) Density (veh/mi) 11 ufk² kj 57 53 45 39 28 21 18 density at maximum volume 21 22 39 60 70 86 97 Determine the density (in veh/mi) at which the maximum volume will occur as well as the value of the maximum volume (in veh/h). 80 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/mi
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